Using multiple calenders

I did a search, but couldn't find any matching content, so here is my questions:

Since Google Sync stopped working for BB I am looking for a new solution to sync more than 1 calender with my BB devices. The integrated Google sync via BIS only syncs the standard calender, but I am using 5 calenders within Google at the moment. The Google Sync app did that without any problems, but Google stopped that unfortunately.

It doens't have to be an online calender to sync with. I am using Thunderbird on my Desktop but if necessary I would switch to Outlook to get the sync working again.

So here's the things I am looking for:

I want to make an appointment on my BB and it sync wirelessly to some account which doens't necessarily provide a browser calender. When I start my computer at home and start Outlook/Thunderbird it should sync the appointments and all has to be the same. Also vice versa of course.